diff --git a/lib/private/Setup/AbstractDatabase.php b/lib/private/Setup/AbstractDatabase.php
index 8690e7c1c66..5ee9548564c 100644
--- a/lib/private/Setup/AbstractDatabase.php
+++ b/lib/private/Setup/AbstractDatabase.php
@@ -141,9 +141,9 @@ abstract class AbstractDatabase {
 	}
 
 	/**
-	 * @param string $userName
+	 * @param string $username
 	 */
-	abstract public function setupDatabase($userName);
+	abstract public function setupDatabase($username);
 
 	public function runMigrations() {
 		if (!is_dir(\OC::$SERVERROOT."/core/Migrations")) {
diff --git a/lib/private/Setup/MySQL.php b/lib/private/Setup/MySQL.php
index 920baf3e4ee..7bd8fa7b1ec 100644
--- a/lib/private/Setup/MySQL.php
+++ b/lib/private/Setup/MySQL.php
@@ -135,9 +135,8 @@ class MySQL extends AbstractDatabase {
 	/**
 	 * @param $username
 	 * @param IDBConnection $connection
-	 * @return array
 	 */
-	private function createSpecificUser($username, $connection) {
+	private function createSpecificUser($username, $connection): void {
 		try {
 			//user already specified in config
 			$oldUser = $this->config->getValue('dbuser', false);